president bush, he should have ran four years ago. >> four years ago, barack obama and john mccain faced off in a first debate that was nearly canceled when the republican suspended his campaign because of the meltdown on wall street. the day of their second debate, the stock market dropped 500 points. >> now the troubles are spreading. the market took another dive today, and there are some big names now involved. >> reporter: the day of the third debate, the stock market dropped over 300 points. >> fear that the country could be entering in one of the most serious recessions in decades, led by wall street's 700-point sell-off. >> now four years later, the president who faced john mccain in those debates and beat him faces his new republican challenger for the first time. >> i'm looking forward to head to head. >> an mirror image of '08, a campaign is chaotic mash. new issues, new controversies, every day. the polls are bad for romney and good for obama in the swing states. but the national numbers are as tight as they get. the primaries are over, the conventions are over, but the debate